#include <stdio.h>

void even ( int a , int b )
{   printf("%d - %d以内的偶数:\n" , a , b );
    for ( int i = a; i <= b; i+= 2)
    {
        printf("%d", i );
        if (i < 10)
        {
            printf("  ");
        }
        else
        printf(" ");
        if (i%20  == 0 && i!= 0 )
        {
            printf("\n");
        }
    }
}
int main(int argc, char const* argv[])
{
    int min, max;
    printf("请输入范围\n");
    scanf("%d %d", &min , &max);
    even( min , max );

    return 0;
}